package coom.zwj.reggie.filter;

import com.alibaba.fastjson.JSON;
import coom.zwj.reggie.common.BaseContext;
import coom.zwj.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配工具,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取本次发来的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求: {}", requestURI);
        //定义不需要处理的请求
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"

        };
        //定义方法判断此请求是否需要处理,不需要直接放行
        if (check(urls, requestURI)) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //检验是否登录,如已登录则放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录,id为:{}", request.getSession().getAttribute("employee"));
            //储存当前登录用户Id到ThreadLocal中
            Long employeeId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(employeeId);
            filterChain.doFilter(request, response);
            return;
        }
        //4-2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");
        //未登录直接返回客户端需要的数据类型,由前端页面进行相关跳转
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配,检查是否放行
     *
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            if (PATH_MATCHER.match(url, requestURI)) {
                return true;
            }
        }
        return false;
    }
}
